Portable electric lamp.



0. C. DENNIS.

PORTABLE ELECTRIC LAMP.

APPLICATION FILED MAR. 2. 19M.

1 9 14,662 Patented Aug. 3, 1915.

OLIVER c. nnNNIs, or CHICAGO, ILLINoIs.

- PORTABLE ELECTRIC LAMP.

Specification of Letters Patent.

Patented Aug. 3, 1915.

Application filed March 2, 1914. Serial No. 821,846.

To all whom it may concern:

Be it known that I, OLIVER C. DENNIS, a.

.resident of Chicago, in the county of Cook with means for magnetically securing it to some part above the point where it is desired.

In making repairs to automobiles it is frequently: desired to illuminate some inclosed or shaded part and it is desirable that the lamp for such use be compact in form and small so that it may be placed in'a tool box without occupying much space.

One object of the invention is to provide a portable, electric, lamp provided with means for magnetically securing it to some part of the car, which may be made in compact form and of small arts, without lessening the illuminating e ciency.

It is also desired, in lamps provided for this purpose, to effectively protect the bulb from breakage when it is not in use, and one ofthe objects of the invention is to provide an improved combined protector and reflector which will occupy little space so that the entire lamp may be packed away in the tool box or in some other convenient place.

The invention further designs to provide an improved portable electric lamp.

The invention consists in the several novel features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings, Figure 1 is a view of the device-embodying the invention. Fig. 2 is a vertical longitudinal section, the lamp being shown magnetically suspended from a superimposed part. Fig. 3 is a horizontal section taken on line 3 3 of Fig. 2.

The improved device comprises a cupshaped casing 10, containing a holding magnet comprising a core 11, a helix 12, and ends 14 and 15. Casing 10 also contains an insulating block 16 di osed between the bottom of casing 10 and t e core 11, and being secured to the core by a screw-threaded projection 17 integral with the block and fitting into a screw-thread in the core. The upper part of the casinglO serves as a conductor for the magnetic flux passing from the core to the disk 15, the upper portion of the casing 10'and the part X to which the magnet is applied. Disk 14 is of insulating material.

The block 16 and the magnet are secured in the casing 10 by screws 20 extending. through the bottom of the. casing and into the disk 15. A lamp socket 21 is secured against the bottom of block .16 by a screw 22 which serves as the tip-contact and is insulated from socket 21 by a washer 23.

The device comprises a screw-plug 25, of usual construction, and is adapted to be connected to a socket which is connected to a suitable source of potential, and the contacts of this plug are connected by flexible conductors 26 and 27 to screws 28 and 29, re spectively, which are secured in block 16. Screw 29 is extended into contact and engagement with the tip-contact screw 22. Branch-conductors 30 and 31 lead from contact-screws 28 and 29, respectively to the helix of the magnet. 1A conductor 33 extends from the screw 28 to the lamp socket 21. An electric lamp 34, of usual construction, is screw-threaded into the socket 21, as well understood in the art. These connections serve to connect the helix of the magnet and the lamp-connections in parallel relation to the source of potential, so that the current will be divided, sufficient current passing through the helix to energize the magnet and cause the casingto be magnetically held on the part X, the remainder passing through the screw 28, conductor 33, lamp socket 21, the lamp, the tip-contact of the lamp, and the screws 22 and 29 to operate the lamp. The block 12 is cut away, as at 35, so that conductor 33 may pass directly from screw 28 to the socket 21.

In the construction described, the parts may be made compact" and comparatively small, so that the device will occupy little space in a tool box or other place where it may be desired to retain the device when it is not in use. The lamp is co-axially disposed with the core of the helix, and in fact, it has been found that in this arrangement, a comparatively small magnet will suflice to hold the lamp. This arrangement also lends itself to simple electrical connections.

A combined reflectorand protector tube 36 fit around the casing 10 and is frictionally held thereon. This tube is cylindrical,

cylindrical tube 36 is polished or has a deflecting surface. In practice, it has been i found that a cylindrical tube of this character will reflect the rays emanating from the lamp and project them over a considerable space and'the tube is extended beyond the end of the lamp a ronsiderable distance, so that the rays will be reflected from side to side of the tube, which will result in dis sipation of the light rays over a considerable area at the side of the tube, some of! the rays making an angle of almost 180, as a result of the lateral reflection caused by the cylindrical tube. Thus, this cylindrical tube effectively serves as a reflector and a protector for the lamp without occupying much space in the tool box. If it is desired to use the lamp Without using the magnet, the tube 36 may be taken off the lower end of casing 10 and slipped on the upper end thereof, so that it will serve as a handle for the lamp.

The invention is not to be understood as restricted to the details set forth, since these may be modified'within the scope of the appended claims, without departlng from the spirit and scope of the invention.

Having thus described the invention, What i I claim as new and desire ters Patent, is:

1. In a portable electric 'lam'p, the combination of a cup-shaped casing, an electromagnet adjacent the open end of and within the casing, an insulating block between the magnet and the bottom of'the casing, a lamp socket secured to the block independently oi the casing and disposed substantially out-; side of the casing, a lamp in the socket, and electrical connections for supplying current to the lamp and to the electro-magnet.

2. In a portable electric lamp, the combination of a cup-shaped casing, an electroto secure by Let- I magnet adjacent the open end of and Within the casing, a lamp socket adjacent the opposite end of the casing, a lamp in the socket, an insulating block t tom of the casing and the magnet, and electrical connections for supplying current to the lamp and to the electro-magnet.

3. In a portable electric lamp, the combination of a cup-shaped casing, an electromagnet adjacent the open end of and within the casing, a lamp-socket adjacent the opposite end of the casin a lamp in the socket, an insulating block fitting between the bottom of the casing and the magnet, screws extending through the bottom of the casingand secured in the magnet for holding the magnet and block in the casing, and electrical connections for supplying current to the lamp and to the electro-magnet.

4. In a portable electric lamp, the combination of an electric lamp, a casing, an electro-magnet adjacent one end of the casing and comprising a core, an insulating block within the casing provided with an integral screw-threaded stud extending into said core, means for securing the magnet in the casing, a socket for said lamp adjacent the opposite end of the casing, and electrical connections for supplying current to the lamp and to the electro-magnet.

5. In a portable electric lamp, the combi-' nation of a. cup-shaped casing, an electromagnet adjacent the open end of and within the casing, an insulating block between the magnet and the bottom of the casing, means for securing the block and the magnet in the .casing, a lamp socket at one end of the block,

a lamp in said socket, a tip-contact screw extending through the socket and into the block for securing the socket to the block independently of the casing, and electrical connections for supplying current to the lamp and to the electro-magnet.

OLIVER .C. DENNIS. Witnesses:

MILDRED STUMPF,

KATHARINE GERLACH.

ting between the bot-' 

